Communication system



3 Sheets-Shee't 1 VENTO?.

' ATTORNEYS.

July 2, 1940. c. R. Dorv COMMUNICATION SYSTEM Filed Nov.v 28, 1936 July2, 1940. c. R, DoTY COMMUNICATION SYSTEM Filed Nov. 28, 195e 3Sheets-Sheet 2 IN VEN TOR.

A TTORNEYS.

July 2, 1940. c. R. DoTY COMMUNICATION SYSTEM 3 Sheets-Sheet 3Filed'Nov. 28, 1936 INVENTOR.

mata@ ATTORNEYS.

Psanadiuly ,2, 1940 PATENT OFFICE 2,206,665 COMM'UNICATIQN SYSTEMCharles R. Doty, Binghamton, N. Y., assigner to International BusinessMachines Corporation,

.New York, N. Y.,

a corporation of New York mnotion November 28, 1936, Serial No. 113,102

8Claims.

Another object of the present invention is the Y provision oi'individual rotary control means, ln place of theusual transmittingcontacts associated with and controlledby the corresponding key bars. i

Another object of the present invention is the provision of controlmeans at the receiver conditioned by the ilrst group of impulses to beoperated at a later time in the operating cycle, and a second controlmeans adapted to be conditioned by the second group oi. impulses andeffective later in the timed cycle to effect selec- 25 tion of a singlecharacter circuit.

Still another object of the invention is the provision of means toprovide overlap, whereby the first said-control means may be conditionedby a second character signal while the second said control means Iiseffective -to select the circuit corresponding to the iirst charactersignal.

Still another object is a novel synchronizing device to establish phasecorrespondence.

Various other objects and advantages of the invention will be obviousfrom the following particular description of one form of mechanismembodying theinvention or from an inspection of the accompanyingdrawings; and the invention also constitutes certain new and usefulfeatures of construction and combination of parts hereinafter set forthand claimed.

In the drawings:

Fig. 1 shows, in part, one type and receiving control unit.

Figs. 2 and 3 show the transmitting and receiving rotary controldevices.

Fig. 4 is a circuit diagram for the transmitting station.

Fig. 5 is a circuit diagram for the receiving station.

of transmitting Referring to the drawings and in particular to Fig. l,one form of a translating unit, such as the Electromatic typewriter,which may be used in the present system, will now be described 55brieiiy. In the embodiment illustrated in the drawings, well known meansare provided for actuating the type bars (not shown) by power operateddevices comprising a power driven roller IU.

A cam II is pivoted on one arm of a bell crank lever I2 pivoted in theframe, the other arm of which is operatively connected with one arm of abell crank lever I3 by means oilink I4. The other arm of lever I3 isconnected to the type bars (not shown) in a well known" manner.

The lever I2 is actuated by the cam Il when the latter engages thedriven roller I0 to be operated thereby. The engagement of the cam Ilwith the power roller is controlled by means of the key lever Il in 'amanner which willnow be described.

'I'he cam II is resilientlysengaged by a springpressed arm 20. whichtends tovturn it into engagement with the power driven roller or stop 2|on a lever 22 pivoted on the bell crank I2 and normally arranged in thepath of a lug on the cam. When the lever 22 swings to move its stop outof the path of the lug, the arm swings the cam into engagement with thepower roller to be actuated thereby to swing the b'ell crank I2 toactuate its connected mechanism.

The lever 22 has an arm 24 which is provided with an oilset projection25 at its end which projects laterally through an opening in the bellcrank I2 and engages the bifurcated lower end 26 of an arm 21 of a keylever I'i pivoted on the common rod 28.

It is obvious then that depression of a key lever I1 releases therevolubly 'mounted cam Il to engage and be actuated by power roller lliin turn operating bell crank I2 and its attached links to cause theassociated mechanism, such as the key bars and other operatingmechanisms, to be operated. n Y

Attached to the key lever il is a connecting link I9 extending to asolenoid IB disposed beneath the keyboard, sothat upon energization ofthe said solenoid the connected key lever is de- Y pressed to operatethe connected mechanism in the manner just explained.

In addition to actuating the several type bars and connected mechanisms,the revolubly mounted cams are adapted to open and close circuits whichmay be employed in the transmitting units. Upon release of the cam I Ithe arm 30 is engaged thereby and displaced to the extent that the stop3| attached thereto releases the dog 32, by releasing members and 46.The arm 30 is latched in the said displaced position momentarily bymeans of the latch member 33. This eective to displace' the arm 35 toreleaseths said dog for the predetermined timed required.

Dog 32 is pivotally 35 which is attached part of commutator or diskmounted et u nn as (Fig. 2), seid ask rotatably-mounted on the shaft 31which is rotated continuously by the commutator brush shaft 38 throughthe reduction gearing 36. Becured to the shaft 31 is a notched clutchmember 40 which is rotated continuously by the shaft, and is providedwith two notches 4 I adapted to be engaged bythe dog 32. The said dog isurged vby spring 42 upon its release to engage the clutch member 40 andas the clutch member is rotated member 46 is loosely mounted on theshaft 31 and is adapted to cause the dog 32 to be released from orengaged with the clutch member 40. When the stop 3| is in the path ofboth niembers 35 and 46, member 46 forces the dog 32 out of engagementwith the clutch member by rotating it partially about its pivot 34thereby rais#l ing the dog out of the notch 4i. Upon release of themembers 35 and 46 by stop 3l, the spring 42 causes the member 46 to berotated slightly, thereby permitting the dog 32 to engage the clutchmember 46 and as the notch 4i is presented thereto, engagement of thedog and clutch member is effected.

The said clutch member is provided with two notches 4I, therefore, uponthe completion of a half revolution the clutch is disengaged to bringthe disk 36 to rest. The disk is provided with two insulated segments 44which are arranged to engage the brushes 43 when the disk 36 is at rest.The disk 36 is adapted to be rotated one half of a revolution during onerevolutionoi.' the transmitting commutator brushes 45 which are rotatedby shaft 36. To provide for stopping and releasing the clutch every halfrevolution, the

members 35 and 46 are extended similarly at each end thereof-so as to beengaged and blocked or released by the stop 3| in the manner just delscribed.

It will be understood that the usual number of key bars and powerdevices with their associated mechanisms are provided, but only one ofthem is shown for the sake of simplicity. It is obvious, therefore, thatfor a simplex system operation the transmitting unit may comprise thedevice just described including the cam operated clutch arrangement, andfor the receiving unit.y

.5I-8 to i4 are connected in combination to the various rotary clutchbrushes 43, so that upon e j apodos i vprovision is made since the camoperation is not v A to or may be an integral bar A isdepressed,.releasing the associated cam over the .segments 5| thereof.

For example, assume that the character-'kei il to operate the associatedclutch member and disk as, it is eeen in Figa that engagement or.. thedog 32 and member 46 is effected at a time s transmitted-te the une n',`as thetransmitting cmnmutator brushes -45 pass when the brush 45 passedover the synchronising ,segment 5i-I5 so that shortlyafterthej 'brushes43 leave the insulated segment 44, the -brush 45 is in position to'engage segment li--I and the other transmitting segments progressively;in this manner the proper time values are always imparted to thecharacter signals.

Release of the clutch disk 36 forI character A conditions the segments6|-2 and 5|-3; that is, the said segments are now active segments fora.v predetermined timed interval which is equivalent to one revolutionof the transmitting brushes 45. Therefore,-as the-brush 45 passes overthe first segment 5I-2, a signal condition is set up by the followingcircuit, one side of the line by common conductor 53 is connected to oneof the brushes 43 and dueto the conducting portion of the disk 36 is nowconnected to the remaining brushes 43, whereby, at this particularinterval, the said line is connected to conductor `54, segment 5I-2,brushes 45, common conducta ing ring 55 to the other side of the line byconductor 56,**energizing the lines at this timed interval. As the brush45 progresses to segment 6I-3, oneside of the line is now connected toconductor 51 to complete the circuit through the said segment againenergizing the line.

It is seen, for each revolution of brushes 45, a synchronizingimpulse'is transmitted over the line as the brushes pass over segment 5i-|5.

Referring now to Fig. 5, a segmented commutator is provided and similarto the transmitting distributor 56, twenty segments 6i are provided andarranged in groups as previously described. Additional segments 62 areprovided to properly phase the receiving distributor motor 63 so as tooperate in phase and synchronism with the transmitting distributor motor(not shown).A Assume that only the synchronizing impulses aretransmitted and that the receiving system is just connected to the lineby closed switch 64 to engage contacts A. If the synchronizing impulsesare received as brushes 65 pass over the synchronizing segment 6I-|5,the signal 66 is energized to indicate the condition of synchronism;however, in the event that the synchronizing pulses are received as thebrushes 65 pass overany vof the segments'62, the relay 61 is energizedto open' the associated contacts 56 momentarily.

The purpose of opening one side of the line to the synchronous motor 63is to cause the motor to slip a pole, thereby adjusting the brushposition of the receiving distributor with respect to lthe brushposition of the transmitting distributor. To limit the pole slipping toone pole per operation of relay 61, a resistance 63 is placed across thecontacts 66 so as to be included in series in the motor supply circuitwhen contacts 66 are opened. When synchronism is obtained, the signal 66is energized indicating the fact and switch 64 nowr is positioned toengage contact B conditioning the system for operation of thetranslating units.

The first group of character signals transmitr transmitter.

ted is provided to energize the controllingsolenoids 1l (Fig. 3) torelease rotary clutches 14 which are released and stopped in exactly thesame'manner'as the clutchesl described in the The energization ofsolenoid 1l displaces the arm 1i to release the dog 12 to e'ngage theclutch member 18 near the end of the `distributor cycle to rotate theconducting disk conductor 18 'and switch 64 to conductor 88 representingthe other side of the incoming line.

Energizing of solenoid 1li-a releases the clutch disk 14.a to connectthe corresponding brushes ll-a to the associated circuits; however, itmust be understood that the dog 12 does not engage the notch or tooth ofthe clutch member 18 (Fig. 3) to rotate the disk ll-a until later in thesaid cycle, that is, approximately when the discondenser ail-a,conductors sa and 1s, switch s4 to conductor 80, charging the condenser.Attached to the distributor brush driving shaft 8l `(Fig. 3) is acontrol ring 85 provided with two conducting segments 86 and 81.Conducting segment 86 is arranged so that during the rotation of thecontrol ring 85 it is adapted to engage brushes 88-a and 88-b andconducting segment 81 at a later interval in the cycle is adapted toengage brushes 88-b and A88-c. lConducting segment 86 is adapted toengage the associated brushes at a time in the cycle `approximately whenthe distributor brushes 65 pass over the segment 6I|5. The length of thesaid segment may be varied, the only provision being that it must be ofsuch length to permit the discharge of the associated condenser 8l to beeffective to energize the particular character key solenoid selected;the segment 81 then engages the associated brushes; a short timedinterval later in the cycle.

As the segment 86 engages the brushes 88--a and 8'8-b, the condenservBI-a just charged is now arranged to discharge through a particularcharacter solenoid to effect the selection of a particular character keybar solenoid from a group of solenoids that are connected to the brushesthereby energizing solenoid i8 for the character A. The other solenoidcircuits for characters Z, Q, and W, etc., are not ailected since theassociated brushes 15--a are engaging the insulated portion of clutchdisks 1li-a. 'I he segment81 then engages brushes Bil-b and 88-c toshort faulty energization of any solenoid circuits in the followingcycles.

It is evident from thedescription just set forth how the other characterselections may be effected and further detailed description thereof isdeemed not necessary. It is also seen that during the condenserdischarge operation to energize the solenoids I8 and effect totaldischarge of the condenser, the first group of signals to energize therotary clutch solenoids 10 `ymay be received on segments BI--i to 1,thus providing a certain degree of overlap in the system.

While there has been shown and described and pointed out the fundamentalnovel features o1 the invention as applied to a single modification,

it will be understood that various omissions and substitutions andchanges in the form and details of the device illustrated and in itsoperation 4may be made by those skilled in the art without departingfrom the spirit of the invention. It is the intention therefore to belimited only as indicated by the scope of the following claims.

What is claimed is as follows: l 1. A communication system comprising aplu rality ot control circuits, and receiving means responsive tocharacter signals comprising control means to select a predeterminednumber of control circuits and means including electrostatic dischargemeans to discharge vthrough a particular circuit of said selected groupto effect selection of a single circuit from the said predeterminednumber oi circuits.

2. A communication system comprising means to receive'character signalsto effect a selection of a single circuit from a plurality oi circuitscomprising control means to select a predetermined number of circuitsfrom said plurality of circuits, and means including a condenser todischarge through one of said predetermined number of circuits foreiiecting the selection thereof.

3. A communication system comprising a plurality of control circuits,and receiving meansy responsive to a plurality of character impulsesduring a predetermined time interval including.

control means conditioned by the first impulses received ata'ccrtaintime in said timed interval and operated at a later time in saidinterval and a second control means including an electrostatic dischargedevice energized by Vthe second impulses received at a certain time insaid interval and effective for discharge at a later time in the same tocause selection of va single circuit from said plurality of controlcircuits.

4. A communication system comprising, in combination means comprisingcyclically operating rotary distributor means for receiving controlsignals represented by a plurality of impulses during one cycle thereof,a plurality of control circuits,A control means conditioned by the firstimpulse receivedduring the cycle and operated at a laten time in thecycle to select a predetermined number of said control circuits, and asecond control means energized by a second impulse received during saidcycle and eiective during part of the following cycle to effectselection of a single circuit from said predetermined number of circuitsselected.

5. A communication system, comprising, in combination, means to receivecontrol signals, a. plurality of control circuits, control meansresponsive to said signals to select a predetermined l number of saidcontrol circuits, and a second control means including means responsiveto said signals and operated under control of the ilrst mentionedcontrol means to effect a selection of a single rcircuit fromsaidpredetermined number of circuits. y 6. A communication systemcomprising, in combination, a plurality o! control circuits, means toreceiveI control signals. control meansresponsive to said signals toselect a predetermined number of circuits from said plurality ofcircuits. condensers charged by said control signals, and means todischarge said condensers at a later timed interval to effect'selectionvof a single circuit from said predetermined number ofcircuits selected.

\ '1. 'I'he invention set forth in claim 6 in which means are providedto discharge the said condensers a second time before being charged bythe said controlsignals.

8. A. communication system comprising, in

combination, means to receive control signals.

circuit selecting means conditioned by said signal and control meansenergized by said signal,

means whereby both the circuit selecting means and control means areoperated at a later time to eilect the circuitl selecting operation, and

CHARIEBR.DOTY.

